Single tooth torque correction in the lower frontal area by a completely customized lingual appliance
- PDF / 2,010,162 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 33 Downloads / 132 Views
RESEARCH
Open Access
Single tooth torque correction in the lower frontal area by a completely customized lingual appliance Collin Jacobs1* , Milena Katzorke2, Dirk Wiechmann2,3, Heiner Wehrbein1 and Rainer Schwestka-Polly3
Abstract Background: Aim of this study was to analyze the efficacy and precision of the completely customized lingual appliance (CCLA) regarding the single tooth torque correction. The study also examined external apical root resorptions as possible side effects of torque correction and the changings of the periodontal situation. Methods: A case series of three patients were included. The patients showed a single tooth torque problem with a gingival recession and were treated with the CCLA. Plaster casts before and after treatment and plaster casts of the set up were scanned and superimposed. Deviations between the two plaster casts were analyzed at different points of interest. Changes of the gingival recession were compared before and after treatment. Relative root resorptions were measured by the orthopantomograms. Treatment times were assessed by the records of the patients. Results were presented descriptively. Results: The mean change of the most apical part of the root reached by the orthodontic treatment was 1.8 ± 0. 3 mm. The largest deviation between set up and final model was measured on the occlusal surface of the tooth 36 with 0.8 mm. Most measurement points showed a deviation of 0.5 mm or less. The depths of the gingival recession showed a significant reduction of 4.7 mm. The widths of the gingival recession were reduced by 1.1 mm. The average relative root resorption of the corrected teeth was 2.7 ± 1.5%. The average treatment time was 13.8 ± 4.5 months. Conclusions: This is the first study showing that the CCLA with its high precision is very effective in correcting single tooth torque problems. Orthodontic torque correction resulted in a significant reduction of gingival recessions and caused only negligible root resorptions. Keywords: Torque correction, Lingual appliance, Periodontal recession, Root resorption
Background In orthodontic treatment with the completely customized lingual appliance (CCLA) the appliance is manufactured for each patient with individual designed brackets and archwires (Fig. 1). It was demonstrated that the tooth positions after orthodontic treatment with a CCLA are very close to the planned tooth positions of this set up [1, 2]. A previous study showed that the CCLA is able to provide a very precise torque control especially of the frontal teeth [3]. The precise control of the axis of the front teeth can be * Correspondence: [email protected] 1 Department of Orthodontics, University Mainz, Augustusplatz 2, 55131 Mainz, Germany Full list of author information is available at the end of the article
especially necessary, if a single tooth needs to be corrected. A specifically single tooth correction is for example needed, if one tooth exhibits a torque problem. Torque describes the tooth axis in the oral-vestibular direction. A torque
Data Loading...
